package com.squareup.picasso;

import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import java.io.IOException;
import java.io.InputStream;

import static android.content.ContentResolver.SCHEME_FILE;
import static com.squareup.picasso.Picasso.LoadedFrom.DISK;

class AssetBitmapHunter extends BitmapHunter {
	protected static final String ANDROID_ASSET = "android_asset";
	private static final int ASSET_PREFIX_LENGTH = (SCHEME_FILE + ":///"
			+ ANDROID_ASSET + "/").length();

	private AssetManager assetManager;

	public AssetBitmapHunter(Context context, Picasso picasso,
			Dispatcher dispatcher, Cache cache, Stats stats, @SuppressWarnings("rawtypes") Action action) {
		super(picasso, dispatcher, cache, stats, action);
		assetManager = context.getAssets();
	}

	@Override
	Bitmap decode(Request data) throws IOException {
		String filePath = data.uri.toString().substring(ASSET_PREFIX_LENGTH);
		return decodeAsset(filePath);
	}

	@Override
	Picasso.LoadedFrom getLoadedFrom() {
		return DISK;
	}

	Bitmap decodeAsset(String filePath) throws IOException {
		final BitmapFactory.Options options = createBitmapOptions(data);
		if (requiresInSampleSize(options)) {
			InputStream is = null;
			try {
				is = assetManager.open(filePath);
				BitmapFactory.decodeStream(is, null, options);
			} finally {
				Utils.closeQuietly(is);
			}
			calculateInSampleSize(data.targetWidth, data.targetHeight, options);
		}
		InputStream is = assetManager.open(filePath);
		try {
			return BitmapFactory.decodeStream(is, null, options);
		} finally {
			Utils.closeQuietly(is);
		}
	}
}
